In what may prove a particularly incendiary cable, US diplomats describe a world of sex, drugs and rock’n’roll behind the official pieties of Saudi Arabian royalty.

Jeddah consulate officials described an underground Halloween party, thrown last year by a member of the royal family, which broke all the country’s Islamic taboos. Liquor and prostitutes were present in abundance, according to leaked dispatches, behind the heavily-guarded villa gates.

The party was thrown by a wealthy prince from the large Al-Thunayan family. The diplomats said his identity should be kept secret. A US energy drinks company also put up some of the finance.

“Alcohol, though strictly prohibited by Saudi law and custom, was plentiful at the party’s well-stocked bar. The hired Filipino bartenders served a cocktail punch using sadiqi, a locally-made moonshine,” the cable said. “It was also learned through word-of-mouth that a number of the guests were in fact ‘working girls’, not uncommon for such parties.”